Public attributes in Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of accessing a public attribute

What is the output of this code?

Python

class Car:
    def __init__(self, brand):
        self.brand = brand

my_car = Car('Toyota')
print(my_car.brand)

A AttributeError

B car.brand

C None

D Toyota

💡 Hint

Public attributes can be accessed directly using the object name.

The attribute 'brand' is public and set in __init__. Accessing my_car.brand prints 'Toyota'.

❓ Predict Output

intermediate

Changing a public attribute value

What will be printed after changing the public attribute?

Python

class Person:
    def __init__(self, name):
        self.name = name

p = Person('Alice')
p.name = 'Bob'
print(p.name)

A Alice

B None

C Bob

D AttributeError

💡 Hint

Public attributes can be changed directly.

The attribute 'name' is changed from 'Alice' to 'Bob'. So printing p.name outputs 'Bob'.

❓ Predict Output

advanced

Accessing a public attribute from outside the class

What is the output of this code?

Python

class Book:
    def __init__(self, title):
        self.title = title

b = Book('Python 101')
print(b.title)

A Python 101

B None

C AttributeError

D book.title

💡 Hint

Public attributes are accessible from outside the class.

The attribute 'title' is public and can be accessed directly using the object b.

❓ Predict Output

advanced

Effect of deleting a public attribute

What happens when you run this code?

Python

class Animal:
    def __init__(self, species):
        self.species = species

pet = Animal('Dog')
del pet.species
print(pet.species)

A AttributeError

B SyntaxError

C None

D Dog

💡 Hint

Deleting a public attribute removes it from the object.

After deleting pet.species, accessing pet.species raises AttributeError because it no longer exists.

🧠 Conceptual

expert

Understanding public attribute behavior in inheritance

Given this code, what is the output?

Python

class Parent:
    def __init__(self):
        self.value = 10

class Child(Parent):
    def __init__(self):
        super().__init__()
        self.value = 20

obj = Child()
print(obj.value)

A None

B 20

C 10

D AttributeError

💡 Hint

Child class overrides the public attribute after calling the parent constructor.

The Child class sets self.value to 20 after calling Parent's __init__, so obj.value is 20.